MATHEMATICS PROBLEM SOLVER

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Monday, 30 July 2018

A. P. 2

The 1st term of an A.P. is 72 and the common difference is 80. Find the 10th term.

Solution

A₁= 72, d = 80

A_n = A₁ + (n-1)d

A₁₀ = A₁ + (10-1)d

A₁₀ = A₁ + 9d

A₁₀ = 72 + (9x80) [ after substituting A₁= 72, d = 80 as given above]

∴ A₁₀ = 72 + 720

A₁₀ = 792

Hence the 10th term is 792.

TRY THIS……………

The 1st term of an A.P. is 160 and the common difference is 219. Find the 5th term.

MATHEMATICS PROBLEM SOLVER

Monday, 30 July 2018

A. P. 2

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