Question

If the first term of an A.P. is -5 and the common difference is 2 ,then the sum of first 6 terms is

Answer 1

Answer:

45

Step-by-step explanation:

$s = n \div 2((a + (n - 1)d) \\ 3(5 + 5\times 2) = 45$

Answer 2

Answer:

answer:18

Step-by-step explanation:

sum=n/2 [2a+(n-1)d]

where, a=-2,d=2,n=6

now....

applying the formula, we get

=6/2×[2×(-2)+5 (2)]

=3 (-4+10)

=3×6

= 18