What is the sum of the first 16 terms of an arithmetic progression if the first term is -9 and last term is 51?
What is the sum of the first 16 terms of an arithmetic progression if the first term is -9 and last term is 51? Correct Answer 336
GIVEN:
First term a = – 9
Last term l = 51
Number of term n = 16
FORMULAE USED:
Sum = n/2 × (a + l)
CALCULATION:
⇒ 16/2 × (- 9 + 51) = sum
∴ Sum = 336
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Feb 20, 2025