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if 18,a,b,-3 are in Ap, then …

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if 18,a,b,-3 are in Ap, then the value of a+b is .......

Posted by Anaya Fatima 6 years, 1 month ago

CBSE > Class 10 > Mathematics

2 answers

Yogita Ingle 6 years, 1 month ago

A = 18
-3 = 18 + 3d
-3-18 = 3d
-21/3 = d
d =-7
a = A + d
a = 18 +(-7)
a = 11
b = 18 +2(-7)
b = 18-14
b = 4

a + b = 11 + 4 = 15

2Thank You

Aadya Singh 6 years, 1 month ago

1Thank You

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CBSE > Class 10 > Mathematics