5. 39,52, 78, 117, 169, ?
(a) 246
(b) 182
(d) 256
234 (ع)
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Answer:
39+1×13 = 52
52+2 × 13 = 78
78+3 ×13 = 117
117+ 4×13 =169
169+5×13 = 234
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