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2) Find 42 for the A.P 12,9,6 |
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Answer» Answer: A42 =143 Step-by-step EXPLANATION: the formula is An=A1 +(n-1)d we have to find A42 given A1 =12 n= 42 d =12-9= 3 =9-6 =3 hence, d =3 substitute, An=A1 +(n-1)d A42 = 12 + (42-1)3 =12+41*3 = 12+123 A42 =143 |
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