which term of the A.P 21,42,63,84-…is 210​

Question

which term of the A.P 21,42,63,84…….is 210​

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Dulcie 5 years 2021-07-31T06:15:00+00:00 1 Answers 9 views 0

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  1. thucuc
    0
    2021-07-31T06:16:20+00:00
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    Answer:

    T₁₀

    Step-by-step explanation:

    We know the first term is 21, which is a

    We work out the difference by taking 21 away from 42 which equals 21.

    We then use the general formula:

    Tₓ = a + (x-1)(d)

    We need to find the term which equals 210

    210 = 21 + (x – 1)(21)

    210 = 21 – 21 + 21x

    210 = 21x

    x = 10

    Hence it is the 10 term when the thing equals 210.

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