What is the sum of the first 20 terms of an A.P, if a =4 and t20=36?

Question

What is the sum of the first 20 terms of an A.P, if a =4 and t20=36?​

Iris · Answer

Answer:   400   Step-by-step explanation:   Here a ( n ) = a + ( n - 1 ) d = last term = a ( 20 ) Sum = 20/2 ( 4 + 36 ) = 10 ( 40 ) = 400. Sum of the first 20 terms is 400

Anna

6 cm
5 cm
11
I
5 cm
i. Length of BD
a. 9 cm
b. 8 cm
c. 7 cm
d. 6cm
ji. Area of M

Write the algebraic expressions for the following cases.

a) Product of numbers x and y subtracted from 15.

b

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