Question

2 + 7 + 13 is dash dash is a AP find the sum of 20term​

Answer 1

Step-by-step explanation:

d = 4

a = 2

number of term = a + (n-1)d

= 2+(20-1)5

= 2+100-5

=97

sum of term=>n/2(2× number of term)

= 20/2 ( 2× 97)

=10 ×2×97

= 1940

Answer 2

FIND THE SUM OF 20TH TERM

$\color{hotpink}{2 + 7 + 13..........}$

Formula used-

$\color{red}{s20 = \frac{n}{2} (2a + (n - 1)d}$

_______________________________

GIVEN

a=>2

d=>7-2

d=>5

n=>20

S20=>

$\color{blue} {\frac{20}{2} (2 \times 2 + (20 - 1)5}$

=>10[4+19(5)]

=>10[4+95]

=10*99

=>990

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