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trasher [3.6K]
3 years ago
12

Which expression defines the given series for seven terms? 8 + 13 + 18 + . . .

Mathematics
1 answer:
almond37 [142]3 years ago
7 0

The given question is 8+13+18+...... which is in arithmetic progression . And for arithmetic series, we have to use the following formula for nth term .

a_{n} = a + (n-1)d

Here a =8 , d=5

So we get

a_{n} = 8+(n-1)5 = 5n +3

And the required expression for n=7 is

\sum_{n=1}^{7}(5n+3)

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