Answer:
Let f_n be the number of rabbit pairs at the beginning of each month. We start with one pair, that is f_1 = 1. After one month the rabbits still do not produce a new pair, which means f_2 = 1. After two months a new born pair appears, that is f_3 = 2, and so on. Let now n 
3 be any natural number. We have that f_n is equal to the previous amount of pairs f_n-1 plus the amount of new born pairs. The last amount is f_n-2, since any two month younger pair produced its first baby pair. Finally we have
f_1 = f_2 = 1,f_n = f_n-1 + f_n-2 for any natural n 3.
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Step-by-step explanation:
(-19^2 - - 19^2) + (14^2 - 6^2) = 160
root of 160 = 12.65 (2dp)
A googol is 10 raised to the power 100 i.e. 10¹⁰⁰
Number of RBCs in an average adult = 2.5x10¹⁰
Number of adults required for 1 googol red blood cells = 10¹⁰⁰ ÷ 2.5x10¹⁰
⇒ Number of adults required for 1 googol red blood cells = 10¹⁰¹ ÷ 25x10¹⁰
⇒ Number of adults required for 1 googol red blood cells = 100x10⁹⁹ ÷ 25x10¹⁰
⇒ Number of adults required for 1 googol red blood cells = 4x10⁸⁹
Hence, 4x10⁸⁹ adults are required to have a total of 1 googol red blood cells
