$$0.35 \times 0.35+0.15 \times 0.15+2 \times 0.35 \times 0.15$$
$0.25$
$$0.1225+0.15\times 0.15+2\times 0.35\times 0.15$$
$$0.1225+0.0225+2\times 0.35\times 0.15$$
$$0.145+2\times 0.35\times 0.15$$
$$0.145+0.7\times 0.15$$
$$0.145+0.105$$
$$0.25$$
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$\frac{1}{2 ^ {2}} = 0.25$
