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4. 2, 10, 30, 68, ..... (a) 130 (c)...
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4. 2, 10, 30, 68, ..... (a) 130 (c) 142 (b) 140 (d) 138
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Ans 130 Diffor ( begin{array}{rl}2 & 10 & 30 & 68 8 & 20 & 38 & 62 14 & 18 & 24 6 & 6end{array} )
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