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Ludmilka [50]
3 years ago
13

Find the sum of an arithmetic 9 terms; 2, 5, 8, 11.... 9

Mathematics
2 answers:
PIT_PIT [208]3 years ago
8 0

Answer:

6

Step-by-step explanation:

Sindrei [870]3 years ago
7 0

Answer:

126

Step-by-step explanation:

the formula for sum of arithmatic progression=n/2(2a+(n-1)d)

=9/2 (4+8*3)

=9/2*(28)

=9* 14=126

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